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Titolo:
KULUMBELLA AND MICROCARDINALIA (CHIASTODOCA) NEW SUBGENUS, EARLY SILURIAN DIVARICATE STRICKLANDIID BRACHIOPODS FROM ANTICOSTI ISLAND, EASTERN CANADA
Autore:
JIN JS; COPPER P;
Indirizzi:
UNIV REGINA REGINA SK S4S 0A2 CANADA LAURENTIAN UNIV SUDBURY ON P3E 2C6 CANADA
Titolo Testata:
Journal of paleontology
fascicolo: 3, volume: 72, anno: 1998,
pagine: 441 - 453
SICI:
0022-3360(1998)72:3<441:KAM(NS>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
BIOSTRATIGRAPHY; PALEOSCENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
J.S. Jin e P. Copper, "KULUMBELLA AND MICROCARDINALIA (CHIASTODOCA) NEW SUBGENUS, EARLY SILURIAN DIVARICATE STRICKLANDIID BRACHIOPODS FROM ANTICOSTI ISLAND, EASTERN CANADA", Journal of paleontology, 72(3), 1998, pp. 441-453

Abstract

Ribbing became an increasingly common feature of pentamerid shells, especially the family Stricklandiidae, during the later Llandovery (Early Silurian). The thin shells of stricklandiids from the Llandovery (Aeronian-Telychian) equatorial carbonate ramp-shelf of Anticosti Islandreveal at least three ribbing designs in various genera; 1) radially arranged ribs, e.g., Costistricklandia; 2) divergent, chevron-like ribs, e.g., Ehlersella; and 3) diagonally criss-cross, mutually intersecting divaricate ribs, as in Lulumbella and Microcardinalia (Chiastodoca) new subgenus. Weakly divaricate species previously assigned to Kulumbella, Stricklandia or Microcardinalia from Anticosti Island, South China and the Baltic region,are assigned to the new subgenus Chiastodoca(type Stricklandinia salterii Billings, 1868), and they are suggestedto have evolved their divaricate ribbing from smooth forms, independently from the earlier genus Kulumbella, in the same sense that radial or divergent ribbing was developed separately in a number of pentamerid and stricklandiid lineages in the late Llandovery and Wenlock. In Anticosti, the divaricate genus Kulumbella, originally described from Siberia, appeared, without a known ancestral form, in the Anticosti Basin las K. xacta n.sp.), and became extinct equally suddenly in the upper part of the Gun River Formation (mid-Aeronian). This sudden arrival of immigrant taxa, originally appearing earlier in other areas, is matched in other brachiopod groups and corals in the Anticosti section. Weakly divaricate ribbing in Chiastodoca is characteristic of the earlyTelychian (Ferum Member, Jupiter Formation), and radial ribbing is typical of the late Telychian genus Costistricklandia (Pavillon Member, Jupiter Formation).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 18:04:33